package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Slf4j
@Service
public class SetmealServiceImpl implements SetmealService {

    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Override
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        PageHelper.startPage(setmealPageQueryDTO.getPage(), setmealPageQueryDTO.getPageSize());
        Integer categoryId = setmealPageQueryDTO.getCategoryId();
        Page<SetmealVO> page = setmealMapper.pageQuery(setmealPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 新增套仓
     * 同时需要保存套餐和菜品的关联关系
     * 需要开启事务
     * @param setmealDTO
     *
     * */
    @Override
    @Transactional
    public void save(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        // 向套餐表插入数据
        setmealMapper.insert(setmeal);
        // 获取生成的套餐id
        Long setmealId = setmeal.getId();
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setSetmealId(setmealId);
        });
        // 保存套餐和菜品的关联关系
        setmealDishMapper.insertBatch(setmealDishes);


    }

    /**
     * 批量删除套餐
     * 需要删除套餐表中的数据，删除套餐和菜品的关联关系数据
     * 需要开启事务
     * @param ids
     * */
    @Transactional
    @Override
    public void deleteBatch(List<Long> ids) {
        // 判断传进来的id是否是起售套餐
        ids.forEach(id -> {
            Setmeal setmeal = setmealMapper.getById(id);
            if (setmeal.getStatus() == StatusConstant.ENABLE) {
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        });
        ids.forEach(id -> {
            // 删除没有起售的套餐
            setmealMapper.deleteById(id);
            // 删除与套餐关联的菜品
            setmealDishMapper.deleteBySetmealId(id);
        });
    }


    @Override
    public void startOrStop(Integer status, Long id) {
        // 起售套餐时，判断套餐内是否有停售菜品，有停售菜品提示"套餐内包含未启售菜品，无法启售"
        if (status == StatusConstant.ENABLE) {
            List<Dish> dishList = dishMapper.getBySetmealId(id);
            if (dishList != null && dishList.size() > 0) {
                dishList.forEach(dish -> {
                    if (StatusConstant.DISABLE == dish.getStatus()) {
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }
        }
        Setmeal setmeal = Setmeal.builder()
                .id(id)
                .status(status)
                .build();
        setmealMapper.update(setmeal);
    }

    @Override
    public void update(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        // 获取套餐id
        Long setmealId = setmeal.getId();
        // 删除套餐和菜品的关联关系，操作setmeal_dish表，执行delete 操作
        setmealDishMapper.deleteBySetmealId(setmealId);
        setmealDTO.getSetmealDishes().forEach(setmealDish -> {
            setmealDish.setSetmealId(setmealId);
        });
        // 重新插入套餐和菜品的关联关系，操作setmeal_dish表，执行insert 操作
        setmealDishMapper.insertBatch(setmealDTO.getSetmealDishes());

    }

    @Override
    public SetmealVO getByIdWithDish(Long id) {
        Setmeal setmeal = setmealMapper.getById(id);
        List<SetmealDish> setmealDishes = setmealDishMapper.getBySetmealId(id);
        SetmealVO setmealVO = new SetmealVO();
        BeanUtils.copyProperties(setmeal, setmealVO);
        setmealVO.setSetmealDishes(setmealDishes);
        return setmealVO;
    }

    /**
     * 根据分类id查询套餐
     * @param setmeal
     * @return
     */
    @Override
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> setmealList = setmealMapper.list(setmeal);
        return setmealList;
    }

    /**
     * 根据套餐id查询菜品选项
     * @param id
     * @return
     */
    @Override
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }

}
